Sauer Danfoss SMF2 Series - CONTENTS Introduction and Description

2
DKMH.PS.330.C1.02 520L0534
Series 20 – Axial Piston Motors
Service Manual and Repair Instructions
Introduction, Description
INTRODUCTION
DESCRIPTION
The purpose of this manual is to provide you with the information necessary for the
normal maintenance and servicing of the Sauer-Danfoss hydrostatic series 20 units.
This includes a description of the units and their components as well as troubleshooting,
pressure setting and repair procedures.
Minor repairs may be performed without affecting the warranty. Major repairs performed
during the warranty time could eventually affect the warranty.
To facilitate easy servicing, the unit has been designed with this in mind.
Many of the individual parts and assemblies are interchangeable throughout the entire
series 20 family. This includes such items as the servo valve, the charge pumps and the
manifold components.
In addition, many repairs and adjustments can be performed without having to remove
the unit from the vehicle, provided that the unit is easily accessible and a thorough
cleaning of the unit is possible before beginning with repairs.
Dirt or other forms of contamination are in most cases the reason for the breakdown
of a hydraulic unit. Please pay attention to cleanliness, not only when making repairs,
but also when putting the unit into operation, changing the oil, changing lters or any
other procedures.
The following manual will provide you with comprehensive instructions for preventative
maintenance and recognition of causes of failure of the axial-piston units.
Sauer-Danfoss axial pistons xed displacement motors are of swash plate design with
preset displacement suitable for hydrostatic transmissions with closed loop circuit.
The output speed is proportional to the motor’s input ow.
The output torque is proportional to the differential pressure applied to the main
pressure ports.
The direction of motor (output) shaft rotation depends on ow input to the main
pressure ports.
The full-length shaft with a highly efcient tapered roller bearing arrangement offers a
high loading capacity for external radial forces.
High case pressures can be achieved without leakage even at the lowest temperatures
by using suitable shaft seals.
Sauer-Danfoss axial piston units are designed for easy servicing. Complete dismantling
and reassembly can be carried out with standard hand tools, and all components or
sub-assemblies are replaceable.
© 1984 -2002, Sauer-Danfoss
Sauer-Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Sauer -Danfoss reserves the
right to alter its products without prior notice. This also applies to products already ordered provided that such alterations can be made without
subsequent changes being necessary in specications already agreed. All trademarks in this material are properties of the respective companies.
Sauer-Danfoss and the Sauer-Danfoss logotype are trademarks of the Sauer-Danfoss Group. All rights reserved.
Front page: F000 248, F000 249, F000 150, F005 101
Series 20 Axial Piston Motors_SR.indd 24.4.2002, 13:302-3